Demystifying StartupWMClass

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https://thoughts.greyh.at/posts/startup-wm-class/

As the maintainer of Plank Reloaded, the most common bug report I get is “this app has the wrong icon.” It’s almost never the dock - it’s a broken StartupWMClass in the app’s .desktop file. So I wrote up how to find the right value on X11, Wayland, and KDE, and why deleting the line often fixes it.

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Oh that’s interesting, I have one program that shows wrong icon but never bothered to fix it.

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